Method and apparatus for transmitting high-frequency signals in optical communication system
AssigneeCommunications Res. Lab., Independent Admin. Inst.
InventorsToshiaki Kuri, Wataru Chujo, Ken-ichi Kitayama
Life of this patent
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Abstract
A method for transmitting high-frequency signals in an optical communication system includes combining an optical signal, the first optical local component from a local light source and the second optical local component from the local light source having a predetermined frequency differential from the first optical local component, selecting the first high-frequency signal which consists of two predetermined electrical components from plural electrical components obtained by the optical frequency mixing process, and mixing the two selected electrical components included in the first high-frequency signal.
Claims15
A method for transmitting high-frequency signals in an optical communication cation system, the method comprising the steps of:
- combining an optical signal, a first optical local component from a local light source and a second optical local component from the local light source having a predetermined frequency differential from the first optical local component;
- selecting a first high-frequency signal which consists of two predetermined electrical components from plural electrical components obtained by an optical frequency mixing process;
- and
- mixing the two selected electrical components included in the first high-frequency signal.
A method for transmitting high-frequency signals in an optical communication system, the method comprising the steps of.
- transmitting an optical signal that includes an optical carrier component and an optical sideband component obtained by modulation with a high-frequency signal whose frequency is predetermined;
- combining the optical signal, a first optical local component from a local light source and a second optical local component from the local light source having a predetermined frequency differential from the first optical local component,,
- selecting a first high-frequency signal which consists of two predetermined electrical components from plural electrical components obtained by an optical frequency mixing process;
- and
- selecting a second high-frequency signal whose frequency is lower by an amount of predetermined frequency differential than a carrier frequency of the first high-frequency signal obtained by the optical frequency mixing process.
A method for transmitting high-frequency signals in an optical communication system, the method comprising the steps of:
- transmitting an optical signal that includes an optical carrier component and ad optical sideband component obtained by modulation with a high-frequency signal whose frequency is predetermined;
- extracting an original high-frequency signal from the transmitted optical signal;
- combining the optical signal, a first optical local component from a local light source and a second optical local component from the local light source having a predetermined frequency differential from the first optical local component;
- making a carrier frequency of the extracted original high-frequency signal coincide with the predetermined frequency differential;
- and
- selecting two predetermined electrical components from plural electrical components obtained by an optical frequency mixing process.
A method for transmitting high-frequency signals in an optical communication system, the method comprising the steps of
- transmitting an optical signal that includes an optical carrier component and an optical sideband component obtained by modulation with a high-frequency signal whose frequency is predetermined;
- combining the optical signal, a first optical local component from a local light source and a second optical local component from the local light source having a predetermined frequency differential from the first optical local component;
- selecting, as a first optical signal, lights containing the optical sideband component included in the optical signal and the first optical local component from the local light source;
- selecting, as a second optical signal, lights containing the optical carrier component included in the optical signal and the second optical local component from the local light source;
- and
- selecting a signal with a relatively low frequency after mixing the first and remand optical signals.
An apparatus for transmitting high-frequency signals in an optical communication system, the apparatus comprising:
- means for combining an optical signal, a first optical local component from a local light source and a second optical local component from the local light source having a predetermined frequency differential from the first optical local component;
- means for selecting a first high-frequency signal which consists of two predetermined electrical components from plural electrical components obtained by an optical frequency mixing process;
- and
- means for mixing the two selected electrical components included in the first high-frequency signal.
An apparatus for transmitting high-frequency signals in an optical communication system, the apparatus comprising:
- means for transmitting an optical signal that includes an optical carrier component and an optical sideband component obtained by modulation with a high-frequency signal whose frequency is predetermined;
- means for combining the optical signal, a first optical local component from a local light source and a second optical local component from the local light source having a predetermined frequency differential from the first optical local component;
- means for selecting a first high-frequency signal which consists of two predetermined electrical components from plural electrical components obtained by an optical frequency mixing process;
- and
- means for selecting a second high-frequency signal whose frequency is lower by an amount of predetermined frequency differential than a carrier frequency of the first high-frequency signal obtained by the optical frequency mixing process.
An apparatus for transmitting high-frequency signals in an optical communication system, the apparatus comprising:
- means for transmitting an optical signal that includes an optical carrier component and an optical sideband component obtained by modulation with a high-frequency signal whose frequency is predetermined;
- means for extracting an original high-frequency signal from the transmitted optical signal;
- means for combining the optical signal, a first optical local component from a local light source and a second optical local component from the local light source having a predetermined frequency differential from the first optical local component;
- means for making a carrier frequency of the extracted original high-frequency signal coincide with the predetermined frequency differential;
- and
- means for selecting two predetermined electrical components from plural electrical components obtained by an optical frequency mixing process.
An apparatus for transmitting high-frequency signals in an optical communication system, the apparatus comprising;
- means for transmitting an optical signal that includes an optical carrier component and an optical sideband component obtained by modulation with a high-frequency signal whose frequency is predetermined;
- means for combining the optical signal, a first optical local component from a local light source and a second optical local component from the local light source having a predetermined frequency differential from the first optical local component;
- means for selecting, as a first optical signal, lights containing the optical sideband component included in the optical signal and the first optical local component from the local light source;
- means for selecting, as a second optical signal, lights containing the optical carrier component included in the optical signal and the second optical local component from the local light source;
- and
- means for selecting a signal with a relatively low frequency after mixing the first and second optical signals.
Dependencies are inferred from the claim text.